Grinding or honing machine



B. O. ISOM GRINDING OR HONING MACHINE Nov. 14, 1933.

Filed May 9, 1952 3 Sheets-Sheet 1 t hv. .2

'Nov. 14,1933, B. 0. ISOM 1,934,858

GRINDING OR HONING MACHINE Filed May 9, 1932 3 Sheets-Sheet 2 3 K2. gvwwwtom Nov) 14, 1933-. B. o. ISOM 1,934,858

" GRINDING OR'HONING MACHINE Filed May 9, 1932 3 Sheets-Sheet 5 Ben/am? Q [5m Patented Nov. 14, 1933 PATENT OFFICE UNITED STATES onmnmo on HONING momma Application May 9, 1932. Serial No. 610,203

6 Claims.

The invention relates to grinding or honing machines designed'for use in finishing cylindrical bores and of that type comprising a rotating and axially reciprocating head carrying a plurality of radially adjustable abrasive members;

The 'outward movement of these abrasive members during the grinding or honing operation is automatically effected by resilient pressure, and

manually operable adjusting means is provided 10 for limiting the outward movement to a predetermined size. Thus in performance of its work on successive cylinders the abrasive members must be collapsed before insertion in the bore and'is then permitted to automatically expand until the grinding or honing operation -is-completed. e

To facilitate the rapid performance of work tools of this character have heretofore been provided with a tubular pilot into which the head may be withdrawn together with an automatic means for collapsing the abrasive members'while in engagement with said pilot. This permits of removing the finished work, aligning another cylinder with the pilot and inserting the tool in said cylinder while the abrasive members are still collapsed. As soon as the tool is completely withdrawn from the pilot the abrasive members will be released'and will thus be permitted to grind or hone the bore until finished size is attained.

On'e difficulty which has been encountered in the use of the construction just described is that the tool on entering the pilot sleeve will have the abrasive members collapsed in advance of complete withdrawal of said members from the bore. It has been found that where this occurs the tool which is still rotating and which has a limitedfreedom for axial displacement may mar a portion of the bore before complete withdrawal. This could be avoided by permitting the tool to remain expanded until completely withdrawn from the bore but it is equally important that during insertion of the tool in another bore it should be completely collapsed. Therefore with constructions heretofore used it has been customary to collapse the tool during the initial movement of withdrawal. It is the object of the present invention to avoid the difiiculties above described and to this end the invention consists in the construction as hereinafter set forth.

In the drawings:

Figure 1 is a sectional elevation showing the tool in connection with my improved mechanism for controlling the same and in position where the abrasive members are nearly withdrawn from suitable construction having the characteristics above described but as shown A is the rotary and axially reciprocating shank or core on which is mounted the head B having a plurality of abrasivemembers C engaging radially adjustable holders D. The detailed construction of the mechanism within the head which controls the radial adjustment of these holders forms no part of the present invention but briefly described is as follows: The holders D are drawn radially inward by resilient spring bandsD at opposite ends thereof. The outward movement is accomplished bra pair of oppositely facing cones E and E arranged centrally within the head and engaging slidable pins E which at their outer ends bear against the holders D. The cones E and E are moved oppositely by the rod F and so tubular rod F concentric therewith which at their upper ends are threaded to engage correspondingly threaded sleevemembers G and G. These sleeve members are coupled to rotate together but are permitted independent axial movement. This independence is, however, limited by a linkage including heads (3% (3': having a shouldered engagement respectively with the] sleeves G and G, the links (3 extending between said heads and bell crank levers G pivoted to the lower ends of said links and having one arm engaging the head G and another arm extending outward through a slot (3 in the hollow core A. Shoes G" in the slots G and projecting outward therefrom, limit the movement of the lever G 5 and under certain conditions actuate the same. Between the heads G and G is a helical spring G under tension to press said heads in opposite directions. Thus the arrangement 15100 such that the spring G operating through the intermediate parts including the rods F and F tends to move the cones E and E towards each other, thereby actuating the pins E and holders D to move the abrasive-members radially outward. Such movement is, however, restrained by the links G and bell crank levers (3 and shoes G, and when said shoes are pressed inward an opposite movement will be imparted to the cones E and E separating the same and per- 'F and F.

members radially inward.

'In addition to mechanism just described, a manual means of adjustment for the cones E and E is provided which consists in a ring or collar H surrounding the upper portion of the shank or core A and rotatively adjustable thereon. This collar actuates the threaded sleeve members G and G through the medium of an internal gear H on the collar and an intermediate gear H which is in mesh with a gear formed on the periphery of the sleeve G. Thus to set the tool to any predetermined limit of radial expansion the collar H is rotated, communicating rotary motion to the'sleeves G and G and turning the threaded portions thereof with respect to the rods The threads in the sleeves G and G are respectively right and left and therefore the rotation of the sleeve H will simultaneously move the cones E and E in opposite directions.

As has been stated, the tool just described is not a part of the present invention and a tool of any other construction capable of performing the same functions may be substituted therefor. My improvement consists in the means for automatically collapsing the abrasive members before insertion of the same into the bore to'be ground, for holding the same thus collapsed during insertion, for then releasing said members to permit the feeding of the same outward under v the actuation of the spring (3: during the grinding operation, to permit said members to remain fully expanded during withdrawal of the tool from the bore, and finally to collapse said memi bers preparatory to insertion of.the tool in another bore. The construction which is employed for performing these functions is preferably as follows: I is a pilot sleeve of an internal diameter corresponding to the size of the finished bore with a slight additional clearance. This pilot sleeve is mounted on a suitable frame J supported by suitable means (not shown) to be held thereby in coaxial relation to the tool, the driving shank A of which extends through this sleeve. K is an inner sleeve having a flaring lower end portion L. This sleeve K is slidable within the sleeve I but is held from rotation by lugs M projecting outward therefrom and engaging vertically extending guide slots N in the sleeve I. The lugs M are also provided with apertured ears 0 which slidably engage rods P secured to the frame J. Helical springs Q sleeved on these rods engage .the ears 0 and normally hold the sleeve K at the upper end of the sleeve I in contact with limiting collars or nuts R on the rods P.

With the construction just. described the pilot sleeve I extends downward into proximity tothe cylinder .or other work tobe' ground which is arranged in axial alignment therewith. In its initial position the grinding or honing tool is withdrawn within this pilot sleeve so as to completely disengage-the abrasive members from the work and so as to also bring the shoes G" into the sleeve K. This sleeve is so proportioned that when the shoes G are moved upward thereinto the flaring portion L will first collapse the shoes and the cylindrical portion L above the flaring portion will hold the shoes thus collapsed. Thus the abrasive members will in this position of parts be radially collapsed and the reaction of the mechanism within the tool which includes the spring (3* wil cause suiiicient outward pressure on the shoes G" to produce a predetermined friction between the same and the sleeve K. This f iction is sufficient so that when the tool is moved downward to engage a' bore to be ground it will carry with it the sleeve K and lugs M which slide downward in the slots N and upon the rods P, compressing -the springs Q. This movement continues until the lugs M are stopped at the bottom of the slots N after. which the continued downward movement ofthe tool will withdraw the shoes G from the sleeve K and permit the abrasive members to expand. This does not, however, occur until the abrasive members have been inserted in the bore for the greater part of their length. As soon as the shoes are disengaged from the sleeve K the springs Q will raise this sleeve to its original position where the lugs O are in contact with the stop collars R. I

From the description just given it will be understood that the tool is held in collapsed position until inserted within a bore to be ground and is then released to be automatically fed outward during'the grinding operation until the set limit is reached. The tool is then withdrawn from the bore remaining fully expanded :until completely disengaged from said bore after which provide adjustable stops at the lower ends of the slots N. These as shown comprise screws S and S engaging threaded apertures in the sleeve I so as to be adjustable to project varying distances upward into the slots N. The lowermost of these members is first set in the proper position and the upper one is then screwed into contact there- 7 with to form a lock and also to constitute the stop for engagement with the lugs M. Thus by properly adjusting these screws any desired point of release may be obtained.

With the modified construction shown in Figure 3 in place of using a non-rotative sleeve K I may employ a sleeve K which is freeto rotate The sleeve K is preferably flared at bothends as indicated at L and L and the upward move ment of the sleeve under actuation of thespring is limited by a'cap T and cushioning'washers T.

What I claim as my invention is:

1. In a machine for grinding or honing cylindrical bores, the combination with a rotatable and axially reciprocating tool having radially adjustable abrasive members, means for resiliently feeding said abrasive members outward and means for arresting said outward movement at a predetermined limit, of means operated by the axial movement of said tool upon the withdrawal of the same from the bore for collapsing said abrasive members and for locking the same in collapsed position, and means operated upon the axial movement of said tool into a bore to be groundfor releasing said locking means.

2. In a machine for grinding or honing cylindrical bores, the combination with a rotatable and-axially reciprocating tool having abrasive members, means for resiliently feeding said abrasive members outward and means for arresting said outward movement at a predetermined limit, of collapsing means for abrasive members, means operated by the axial movement of said tool subsequent to the withdrawal of the same from the bore for actuating said collapsing means and for locking the same in collapsed position, and means operated by the axial movement of said tool after the insertion of the same into a bore to be'ground for releasing said locking means.

3. In a machine for grinding or honing cylindrical bores, the combination with a rotatable and axially reciprocating tool having radially adjustable abrasive members, means for resiliently feeding said abrasive members outward to a predetermined limit and means forcollapsing said abrasive members against the resilient pressure of .said feed means, of a pilot sleeve into which said tool is withdrawn on the removal of the same from a bore, means within. sleeve for actuating said. collapsing means-and; forsl'ocking the same in collapsed: position, and means operating. at a predetermined, point inthe? axial movement of said tooliinto a bore to. be ground for releasing; said locking means;

4. In a machine forrgrinding or honing: cylindrical bores, the combination with a rotatable and axially reciprocating tool having radially adjust-- able abrasive members, and means for: resiliently feeding said members outward to a predetermined limit, of: mechanism carried said tool for collapsing said. abrasive.- members includ- I ing a shoe mounted; on the shank of said: tool, a

shank after said tool has been inserted into the bore to be ground.

5. In a machine for grinding or honing cylindrical bores,. the combination with a rotatable and axially reciprocating tool having radially adjustable abrasive members, means for resiliently feeding said abrasive members, outward to a predetermined limit and means for collapsing said abrasive members including a shoe mounted on the shank of said tool, of means controlling the collapsing and expansion of said radial members comprising a pilot sleeve into which said tool is withdrawn upon removal from a bore, a sleeve within said pilot sleeve surrounding the shank of said tool and engaging said shoe to depress the same after said tool is withdrawn from the bore, a yieldable support for said last mentioned sleeve permitting the inward movement of the same with said tool under the friction of engagement with said shoe, an adjusting stop for limiting the inward movement of said sleeve, said stop being positioned to release said shoe after the. reinsertion of said tool with the bore to be ground.

6:. a machine for grinding or honing cylindri'cal; bores the combination with a:. rotatable and axially reciprocating tool having radially said'abrasive members including a shoe mounted on the shank of said tool,.. of means controlling the collapsing and expanding of said radial memhers comprising a pilot sleeve to which said tool is withdrawn upon removal from a bore, a1. sleeve rotatively secured within. said pilot; sleeve surrounding the shank of said tool and frictionally engageable with said shoe and a spring within said pilot sleeve yieldably supporting said inner sleeve and permitting the downward movement thereof by frictional engagement with. said shoe;

,for holding said abrasive members; incollapsed position while entering the bore toground.

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